1) it doesn't work outside of iOS/macOS really. 2) it's an app on both platforms with it's own communication protocol You can use Google Photos similarly and

1) it doesn't work outside of iOS/macOS really. 2) it's an app on both platforms with it's own communication protocol You can use Google Photos similarly and it's cross platform. Not sure about commments tho Line and Facebook also have "private" social media feeds. By private I mean only people you approve can view. No idea how mined they are for data for ads